Electronic Relay (CB14743E)

This assembly is from 1957 from a Raytheon manual, but can be modernized using a BC548, 6 V power supply and common 100 mA relays.

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Dwell Meter (CB4961E)
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
MICRF114 Remote Control Development Kit (COM107E)
September 2016 - It can be obtained from Mouser Electronics a kit for developing wireless remote...
Solar Radio (CB11510E)
This simple solar powered MW receiver was obtained from a 1974 Popular Electronics. The transistor can...